Metal-finishing tool



Feb. 13, 1923.

4 H. A. MILLER.

METAL FINISHINGTOOL.

FILED DEC. I7, 1921.

' pingframe. I 1 1 '3n0tlier object of the invention i m HARRY A.MILLER, OF WASHINGTON COURT HOUSE, OHIO, ASSIGNOR ONE-HALE TO R; R.MERRIWEATHER AND ONE-HALF TO R. S. WATERS, BOTH OF WASHING- TON COURTHOUSE, OHIO.

METAL-FINISHING roon.

Application filed December 17, 1921. Serial No. 523,064.

To all whom it may concemn Be it known that HARRY A. MILLER, a citizenof the United States, residing at Washington Court House, in the countyof 5 Fayette and State of Ohio, has invented certain new and usefulImprovements in Metal- Finishing Tools, of which the following is aspecification.

/ This invention relates to an improved device for smoothing, polishingand finishing the inner surfaces of metallic tubular bodies,

and an object of the inventionresides in.

the provision of an attachment of this nature specifically designed forsmoothing metallic surfaces initially cut by boring tools, or otherproved cylinder finishing tool comprising the present invention, thetoolbeing shown rotary cutters.

Another object of the invention resides in the provision of a finishingtool primarily adapted for the smoothing of the internal Walls of thecylinders of internal combustion engines following the boring orreboring of said cylinders, in order to overcome and eliminate therelative roughness and unevenness-remaining on such walls following the25 .operation of the boring or cutitng tools, the

object being to finish said walls with such exactness that properrelationship will exist between said cylinder walls and the pistonsmovably mounted therein to avoid loss or leakage in engine compression.1 l

The invention resides in' a finishing tool of the above characterwhereinis included a rotatable standard or shaft extension arranged'to bemounted in registration with the longitudinal axis of a tubular body andwherein said extension' is provided with a pivotally connected framepressed out- 'wardly byla spring interposed between the frame and theextension, the latter having 40 its outerend, in turn, pivotallyconnected to the intermediate portion of a holder arranged to carry a-Whetstone or the like having rounded edges disposed for engagement withthe internal circular wall of said body,

.the .arrangeme nt being such that-the whete stone will be caused torevolve in unison with said shaft, extension, will be forced intoengagement with thewall to be finished by the action of the spring, andwill be flushly engagedwith said wall by reason of the pivotalconnection existing between the holder of thestone and the outer end ofthe swingprovide means for adjusting the tension ex} and in an effectiveholder construction for removably retaining the Whetstone in itsoperative position within the tool.

For a further understanding of the invention reference is to be had tothe following description and to the accompanying sheet -of drawing,inwhich similar characters of reference denote like and correspondin partsthroughout the several views thereo In said drawings:

Figure l is a side elevation of the imin an operative position within anengine Figure 4: 1s a similar view on the line of Figure. 2.

Referring more particularly to the details of the invention, thenumer'all designates my improvedcylinder finishing tool-in its entirety.This tool consists ofan axially rotatable standard or 'shaft'extension 2turned" down from cylindrical stock to provide an. enlarged upperportion 3, in which is formed athreaded socket or its equivalent 4, ar-

ranged for the reception of. the similarly threaded lower end of arotating "spindle 5.'

It will be understood that this spindle may constitute a part of anysuitable machine'oapable- ,of rotating :the spindle -.at desired speedsand toi effect. vertical movement on the part thereof su'ch, forinstance, as a drill. press. Preferably, the spindle .5'o0nst1tutes apart of a boring machine in which the out-'; ters have been removed andthe finlshing tool applied in lieu thereof. A specificuse l of theinvention consists in adapting the same to the finishing of reboredengine cylinders. As is well known the cylinders of internal combustionengines after more or less usage become'worn to an extent which,

in. order to preserve the eflicieney of'the env w gine, necessitates thereboring of said cylin ders for the purpose oftruing the same and,

to permit of proper engagement between the piston rings and-the walls ofsaid-cylinders.

Ordinarily boring tools leave the engine cylinders cut thereby in acomparatively rough and unfinished condition, which must be dressed,polished or finished by other means to procure requisite smoothness inthe c linder walls. Devices heretofore propose for this purpose havebeen difficult to operate,

cumbersome in application and unless skillfully operated do not roducesurfaces of required smoothness. herefore, to overcome these objections-I have designed the attachment or tool 1, which may beconveniently operated to secure surfaces of desired finish with but aminimum of expense and expendlture of labor and time.-

" In Figure 1 the numeral 6 designates a tubular or cylindrical body,whichmay constituteithe cylinder of an internal combus tion engine. Itwill be noted that the "spindle 5 is'positioned in the true axial centerof the cylinder, and after the, boring operation, while the cylinderisretained in true axial registration with the spindle 5, the latter iselevated, the cutting or boring tools removed therefrom and thefinishing tool 1 comprising the present invention, applied to thespindle 5 in the manner shown in Figure 1. By this operation the axialcoincidence between the tool 1, the spindle 5 and the body 6 ispreserved so that the finishing tool may properly follow and completethe work initially started by the boring tools.-

' Pivoted. as at 7 to the extension 2 is a frame 8, which is of generalrectangular form and includes spaced parallel downwardly extending arms8' united in this iristance by anintegral transversely extending web 9disposed in spaced relationship from a plane surface 10 provided uponthe extension 2 by reducing the forward face of the latter, relative tothe upper portion 3 thereof, as indicated at 11. The lower ends of thearms 8' are pivotally connected to the in-. termediate portion of astone holder 11' as at 12, in such manner that the holder will bepositioned between the lower ends of the arms S and permitted tooscillate independ-' ent-ly of the frame 8 generally. llhe holder 11'comprises a split body consisting of separable sections 13 united bytransverse screws 14, ribs 15 being provided upon the.

outer edges of the sections 13 for cooperation with the sides of agrinding or polishing stone 16. Liners 17 may be inserted between theside faces of the stone 16 and ribs 15 for the purpose of enabling thesections shaft extension is provided with a socket 19, in, which ispositioned a coilspring 20, having its outer end disposed for engagementwith the inner face of the web 9, the

inner end'of said spring engaging with an adjustable screw 21 which uponbeing ad justed controls the tension exercised by the s ring 20 uponthe. frame 8. A stud 22 is adjustably. positioned in the surfaces 11 ofthe shaft extension for the purpose of limit- In view of the foregoingit will be seen that in operation the shaft extension is positioned inregistration with the longitudinal axis of an engine cylinder and thesaid 20 constantly urges the frame u shaft extension is rotated andvertically raised and lowered with respect to saidcylinderiby thespindle 5, which may be. actuated by any suitable means. When thuspositioned the stone 16 of the .tool will be disposed in engagement withthe internal circular wall of the cylinder so that-said surfaces ;willbe polished, ground to a limited extent and smoothly finished by therotation of the stone therein. It will be observed that by theemployment of the pivoted frame 8 and the sprin'gQO the stone will beforced outwardly with sufficient ressure to properly engage with the.cylin or wall and WIT/h a suflicient degree of friction to assure properfinishing of the cylinder Wall. Again, by pivoting'the lower ends of theparallel base of said frame to the intermediate portion of the stoneholder the latter will be permitted to oscillate independently of saidframe, so thatthe rounded edges 18 of the stone will be automaticallymaintained in parallelism with the wall of a cylinder thus compensatingfor irregularities inthe axial alignment of said cylinder with theextension 2'. What is claimed is:

In a tool of the class described, a rotatable shank, a frame including aweb, means for. pivotally connecting the web to the shank, said webhaving a pair of spaced arms depending from its lower edge, resilientmeans carried by the shank and engaged with the web for forcing theframe outwardly, a holder pivotally mounted intermediate its endsbetween the lower ends of said arms, and a finishing stone carried bythe holder, as and for the purpose set forth. 7

In testimony whereof I aflix my signa-v ture.

HARRY A. MILLER.

